Litter box



FIG. 1 is a top front right perspective view of one embodiment of a litter box showing our new design;

FIG. 2 is a top rear perspective view thereof;

FIG. 3 is a bottom left perspective view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a right side elevation view thereof, the left side elevation being a mirror image thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines shown in the drawings depict portions of the litter box that form no part of the claimed design. 

CLAIM The ornamental design for a litter box, as shown and described. 